I have owned my RAAL 140-15D dipole ribbons for about 15 months now and absolutely love them. I am planning a new build with them, "hopefully" the last (yeah right, right?). I am planning a nice project for a future man cave paired with Accuton C173-6-090 mids and GR Research Servo open baffle subs. Actively amplified with Hypex UcD modules and preamp/DAC/crossover/processor will be a highly regarded car audio Helix DSP.

The RAAL dipole tweeter employs a formidable faceplate. How have other owners of this ribbon tweeter integrated it in their designs? I think I have an idea for how I want to mount it alongside the Accuton mid, likely using a thin wood fascia around the outside to bring the faceplate flush (I am no expert with a plunge router). Looking forward to what others have done with these

Or do I go with the SEOS waveguide, something I definitely want to consider for my build, allows very low crossover for RAAL to cover more midrange:

Personally I would say no to the SEOS waveguide. Don't try to push the RAAL too low. If need be, use a better mid-bass- one that can go high enough without problems. When I say high enough, I mean to at least 5kHz. Don't cross the RAAL lower. It is rated to to lower, but I would not do it.

I will say +1 for the GR Research Servo open baffle subs, though. Between the RAAL and the servo subs, you will have to work really hard to get something as good. There are many options. Maybe some high quality pro mids, like the Faital 8PR200 or one of the PHL mids (but I'm not sure if the PHL mids go high enough). Or if you want to go more left-field, maybe some Saba greencones with Altec mid-bass (ala Lampizator P24).

Thanks for your response. The beauty of the SEOS guide is that you aren't "pushing" the RAAL when crossing lower, it simply works with what is already there by raising efficiency below 4khz. I am pretty stuck on using the Accuton midbass and I will likely experiment with a 2-3khz crossover point. When I had the Excel drivers, my transition with the W15CY001 was 2250hz and the RAALs handled it like a dream, incredible sound. And that was w/o the SEOS waveguide.

However, I have become intrigued by the PHL drivers and will check into them as a possibility.